Casey — A Revision of the American Paederini. 227 



Color blackish-piceous, pruinose with very fine pubescence; head quad- 

 rate behind the eyes, the hiud angles rounded, the base " emarginate," 

 densely punctate and dull above, the under surface densely and ru- 

 gosely punctured; proslernum very feebly carinate; prothorax small, 

 hexagonal, the base one-half wider than the apex, the sides obtusely 

 rounded, broadly subangulate before the middle, the punctures fine 

 and close-set but with the surface rather shining, the punctures smaller 

 than those of the head, the median impunctate line distinct, moderately 

 wide and not elevated; elytra strongly transverse, not longer than the 

 prothorax, as wide as the head, flaely, moderately densely punctate, 

 the punctures distinctly separated ; abdomen finely, densely punctate. 

 Male with the fifth ventral not modified, the sixth with a small rounded 

 median sinus at apex, the surface not modified. Length 4.7 mm.; width 

 1.0 mm. California quadriceps Lee. 



Color dull rufo-testaceous, the legs and antennae concolorous, the head 

 and abdomen above black, dusky beneath; body nearly similar to the 

 preceding but with the prothorax slightly larger, not quite as long as 

 wide, with the base very nearly twice as wide as the apex and the 

 median impunctate line very narrow; elytra less transverse but much 

 shorter than wide, somewhat longer than the prothorax and fully two- 

 fifths wider, as wide as the head; abdomen short, at base fully as wide 

 as the elytra, the sides parallel and arcuate, the third and fourth seg- 

 ments materially wider than the elytra or head. Male somewhat smaller 

 and less stout than the female, the fifth ventral very feebly sinuate in 

 about median third at apex, the adjoining surface feebly flattened, less 

 punctured and glabrous; sixth segment not distinctly visible in speci- 

 mens at hand but apparently with the sinus larger and shallower than 

 in quadriceps. Length 3.5 mm. ; width 1.1-1.2 mm. Manitoba (Winni- 

 peg) hauhami Wickh. 



The characters of quadriceps, given above, are derived from 

 the original description and from some pencil notes taken by 

 the writer from the original type some years ago. The forms 

 from Missouri and Massachusetts, said by Dr. LeConte to be 

 identical, are unknown to me at present. Of hanhami Wick- 

 ham, I have three specimens. 



Megastilicus Csy. 



This remarkable myrmecophilous genus is founded upon a 

 large species, of very stout form, with unusually small orbic- 

 ular head, densely opaque integuments of the head and pro- 

 thorax and with sparse vestiture consisting of short suberect 

 stiff bristles, which characters give it a facies wholly without 

 parallel in the subtribe. It may be described as follows: — 



